﻿// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

#nullable disable

namespace Microsoft.DotNet.Cli;

internal static class CommandDirectoryContext
{
    [ThreadStatic]
    private static string _basePath;

    /// <summary>
    /// Expands a path similar to Path.GetFullPath() but gives unit tests a hook to inject an overwrite to the
    /// base path.
    /// </summary>
    /// <param name="path">A relative or absolute path specifier</param>
    /// <returns>The full path to the target</returns>
    public static string GetFullPath(string path)
        => _basePath != null
            ? Path.GetFullPath(path, _basePath)
            : Path.GetFullPath(path);

    /// <summary>
    /// Meant to be used only in unit test to remove dependency on special characters in the absolute repo path
    /// The overwrite will only affect the current thread.
    /// </summary>
    /// <param name="basePath">Directory to be used as base path instead of the current working directory.</param>
    /// <param name="action">Action to be executed with the overwritten directory in place.</param>
    public static void PerformActionWithBasePath(string basePath, Action action)
    {
        if (_basePath != null)
        {
            throw new InvalidOperationException(
                $"Calls to {nameof(CommandDirectoryContext)}.{nameof(PerformActionWithBasePath)} cannot be nested.");
        }
        _basePath = basePath;
        Telemetry.Telemetry.CurrentSessionId = null;
        try
        {
            action();
        }
        finally
        {
            _basePath = null;
        }
    }
}
